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Fair Value Measurements (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount | $ 0.0 | $ 0.0 |
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount | 0.0 | 0.0 |
Fair value of long-term debt | 719.8 |  | $ 712.6
Long-term debt, net of debt issuance costs | 702.0 |  | 690.6
Investments, Fair Value Disclosure, Measured at NAV | 184.2 |  | 195.0
Foreign currency forward contracts, gross notional value | 2,290.0 |  | 2,430.0
Foreign currency forward contracts, net notional value | 1,270.0 |  | 1,820.0
Foreign Currency Transaction Gain (Loss), Unrealized | (7.2) | $ 11.3 |
Deferred compensation plan, contra-equity, shares held in trust | 6.0 |  | 5.9
Foreign Exchange Contract [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative Asset, Fair Value, Gross Asset | 3.1 |  | 14.4
Derivative Asset, Fair Value, Gross Liability | 1.3 |  | 1.2
Derivative Liability, Fair Value, Gross Asset | 0.9 |  | 2.3
Derivative Liability, Fair Value, Gross Liability | 9.9 |  | 4.2
Long-Term Senior Notes [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Unamortized Debt Issuance Expense | 4.2 |  | 4.3
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Foreign currency forward contract, current asset amount | 1.8 |  | 13.2
Foreign currency forward contract, current liability amount | 9.0 |  | 1.9
Deferred compensation plan assets | 251.1 |  | 229.7
Deferred compensation plan liabilities | $ 248.6 |  | $ 228.4

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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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